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Medford Nutrient Limit Assessment Report

Medford Nutrient Limit Assessment Report Final March 24, 2020

Determine what degree of nutrient discharge reduction may be needed to ensure that the City’s municipal wastewater treatment plant does not contribute to exceedances of the biocriteria standard (OAR 340-041-0011) in the Rogue River outside the regulatory mixing zone (RMZ) defined in the City’s NPDES Permit...

CONCLUSIONS AND RECOMMENDATIONS
Based upon three previous studies (Hafele 2013, Brown and Caldwell 2014, ODEQ 2014) examining periphyton and benthic macro-invertebrate community composition in relation to discharges from the City of edford’s (City) municipal wastewater treatment plant, Stillwater Sciences (2019) identified nutrient enrichment associated with RWRF effluent as a contributing 3 Violin plots after Hintze and Nelson (1998) showing probability density (blue shading) of daily discharge by month, superimposed by box plots showing 25th, 50th, and 75th percentiles as well as extreme daily discharge values. CONFIDENTIAL FRE 408 SETTLEMENT COMMUNICATION FINAL REPORT Nutrient Discharge Limit Assessment for the Rogue River in the Vicinity of the City of Medford Water Reclamation Facility March 2020 Stillwater Sciences 58 factor to increased algal biomass and associated changes in macroinvertebrate community structure downstream of the regulatory mixing zone (RMZ) defined in the City’s NPDES Permit. To determine appropriate nutrient discharge limits needed to ensure that the City’s regional water reclamation facility (RWRF) does not contribute to exceedances of the State of Oregon biocriteria standard (OAR 340-041-0011) in the Rogue River outside the RMZ, the City developed a study plan for additional sampling and analysis during 2019 in cooperation with Northwest Environmental Advocates (NWEA)...

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